Know all men by these presents



y @uilen gtst-es 'ig-enact'y @fitte v i HnN. KEABLESg-OF WORCESTER,MASSACHUSETTS.

I Letters Patent No.66,35i4, dated July 2,1867.-

IMPRO'VEMENT IN GEAR-GUTTBRS.

ttige Stlgtmle rennl tu iu time tcttecs ufeni .mit mating ,tutt nf tigestmt KNOWALL MEN BY THESE PRESENTS:

That I, H. N. KEABLES, of the city'und county of Worcester, undCommonwealth of Massachusetts, have 'inventedu certain new und usefulImprovementl in Cutters; und I do hereby declare that the following is ndrive the cutter than it does to drive one of the same size medeaccording to the old plztn full, clear, and exact description of thesame, reference being hndto the ztccompany port of this specification,in which- Figure 1 represents aside view of a. cutter for cutting gears,mede according to my invention, and

'Figure 2 represents a section ot' iig. 1, on line A. B, look-ing in thedirection'indiceted by the arrow.

As cutters huve heretofore been made the cutting-teeth A have followedeach other in regula-r order and at equal distances apart, and thosewho. nre acquainted with or skilled in the nrt of gear-cutting know that'oftentimes the chips so clog up and crowd inbetween the cutting-teethand the sides-of the cdgs on the blank being cut as to injure the work,and often'to such an extent as to derange thewhol'e operation. I'nalnrge class of work it is very important to have the sides of' the cogscut with great precision and evenness, and it is a greet source oi"annoyance and expense to -have the Work injured by the clogging orchattering of' the cutters.

To lemedy the foregoing1 and other-objections to the old style ofcutters is the object of my present invention, and whichconsists inleaving n clearing spnce, a, at regular and equal distances nipert,l undwhich distance I have found to produce the best results, if m'rainged soes to occur after .two teeth, as shown in g. 1. It might ocour'efterthree or niore't'eeth, but I prefertwo teeth.I The resultis that thecutter always runs-smooth and easy, doing its work even and true, andnever clogging up. The same principle could be applied with .f foodeiect to side or slabbing cutters, as theyare culled.

With my cutter there is no chattering and the work is unequalled,besides it requires less power to ing drawings, forming a.

The mode of using the cutter isthcsane as that in common use, the cutterbeing placed upon n revolving arbor, spindle, or similar device. lHeving described my improved cutter, what I claim therein as new and ofmy invention, und desire to secure by Letters Patent, isi t Agear-cuttingtoel of continuous operation by revolution, thecutting-teeth of which are arranged radially et equal distances fromtheir centre of revolution in groups, leaving equidistant and'equal-sized between said groups, and otherwise constructedsubstantially as and for the purposes set forth.'

H. N. "KEABLES.

clearing spaces Witnesses:

Trios. H. DoDoE,. D. L. MILLER.

